Jvc-XLSV-205-GD-Service-Manual电路原理图.pdf

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1、SERVICE MANUALVIDEO CD PLAYERXL-SV205GDContentsSafety precautions - 1-2Preventing static electricity - 1-3Disassembly - 1-4Description of major IC - 1-5XL-SV205GDPOWER 1 MIC VOLUME 2 ECHOOPEN/CLOSERETURN1 MIC 21 2 3 4 5+10 6 7 8 9 10/0ON / OFFMIN MAX MIN MAX MIN MAX10/01 2 36547 8 9VCD / CD 10 KEY10

2、+P/NNo:28206Jun. 2001COPYRIGHT 2000 VICTOR COMPANY OF JAPAN LTD.IMPORTANTPLEASE TAKE NOTE BEFORE ORDERING1. Order all service parts through JVC ASIA PTE LTD.-Customer Satisfaction Dept.2. Two order are availiable: Initial order and last order (Before End of Line).3. Minimum order quantity: 100pcs4.

3、Delivery term: Minimum 2 months upon confirmation of order.1-2XL-SV205GD1. This design of this product contains special hardware and many circuits and components specially forsafety purposes. For continued protection, no changes should be made to the original design unlessauthorised in writing by th

4、e manufacturer. Replacement parts must be identical to those used in theoriginal circuits. Services should be performed by qualified personnel only.2. Alterations of the design or circuitry of the product should not be made. Any design alterations of theproduct should not be made. Any design alterat

5、ions or additions will void the manufacturers warrantyand will further relieve the manufacture of responsibility for personal injury or property damage resultingtherefrom.3. Many electrical and mechanical parts in the products have special safety-related characteristics.These characteristics are oft

6、en not evident from visual inspection nor can the protection afforded bythem necessarily be obtained by using replacement components rated for higher voltage, the PartsList of Service Manual. Electrical components having such features are identified by shading on theschematics and by ( ) on the Part

7、s List in the Service Manual. The use of a substitute replacementwhich does not have the same safety characteristics as the recommended replacement parts shownin the Parts List of Service Manual may create shock, fire, or other hazards.4. The leads in the products are routed and dressed with ties, c

8、lamps, tubings, barriers and the like tobe separated from live parts, high temperature parts, moving parts and/or sharp edges for the preventionof electric shock and fire hazard. When service is required, the original lead routing and dress shouldbe observed, and it should be confirmed that they hav

9、e been returned to normal, after re-assembling.5. Leakage current check (Electrical Shock hazard testing)After re-assembling the product, always perform an isolation check on the exposed metal parts of theproduct (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts,

10、etc.)to be sure the product is safe to operate without danger of electrical shock.Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using a “Leakage Current Tester”, measure theleakage current from each exposed metal parts of the cabinet, p

11、articularly and exposed metalpart having a return path to the chassis, to a known good earth ground. Any leakage current mustnot exceed 0.5mA AC (r.m.s.) Alternate check methodPlug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms pervolt or more sensitivity in the

12、 following manner. Connect a 1,500 10W resistor paralleled by aWarning1. This equipment has been designed and manufactured to meet international safety standards.2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.3. Repairs must be made in accordan

13、ce with the relevant safety standards.4. It is essential that safety critical components are replaced by approved parts.5. If mains voltage selector is provided, check setting for local voltage.0.15F AC-type capacitor between an exposedmetal part and a known good earth ground.Measure the AC voltage

14、across the resistorwith the AC voltmeter.Move the resistor connection to each exposedmetal part, particularly any exposed metal parthaving a return path to the chassis, andmeasure the AC voltage across the resistor.Now, reverse the plug in the AC outlet andrepeat each measurement. voltage measuredAn

15、y must not exceed 0.75 V AC (r.m.s.). Thiscorresponds to 0.5 mA AC (r.m.s.).Safety precautions0.15F AC TYPE1500 10WPlace thisprobe oneach exposedmetal part.Good earth groundAC Voltmeter(Having 1000ohms/volts,or more sensitivity1-3XL-SV205GDPreventing static electricityElectrostatic discharge (ESD),

16、which occurs when static electricity stored in the body, fabric, etc. is dis-charged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this whenperforming repairs.1.1. Grounding to prevent damage by static electricityStatic electricity in the work area can dest

17、roy the optical pickup (laser diode) in devices such as DVD players.Be careful to use proper grounding in the area where repairs are being performed.1.1.1. Ground the workbench1. Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate overit before placing th

18、e traverse unit (optical pickup) on it.1.1.2. Ground yourself1. Use an anti-static wrist strap to release any static electricity built up in your body.1.1.3. Handling the optical pickup1. In order to maintain quality during transport and before installation, both sides of the laser diode on therepla

19、cement optical pickup are shorted. After replacement, return the shorted parts to their originalcondition. (Refer to the text.)2. Do not use a tester to check the condition of the laser diode in the optical pickup. The testers internalpower source can easily destroy the laser diode.1.2. Handling the

20、 traverse unit (optical pickup)1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For spe-cific details, refer to the replacement procedure

21、 in the text. Remove the anti-static pin when replacing thetraverse unit. Be careful not to take too long a time when attaching it to the connector.3. Handle the flexible cable carefully as it may break when subjected to strong force.4. It is not possible to adjust the semi-fixed resistor that adjus

22、ts the laser power. Do not turn it.Conductive material(conductive sheet) oriron plate(caption)Anti-static wrist strap1-4XL-SV205GDDisassemblyProcedure of disassemblyNo. Description QTY. Action Remark1 Main part 1 Place2 Plane tray 1 Remove Turn on VCD, open the plane traythen take up the CD door.3 S

23、elf screw 1 Loosen screw Loose the screw, remove from the upper cover.4 4.0 Self screw 4 Loosen screw5 Upper cover 1 Remove Loose screws then remove the upper coverfrom the main part.6 Self screw 5 Loosen screw7 Self screw 1 Loosen screw8 Front panel block 1 Remove Remove the front panel block from

24、the main part.1-5XL-SV205GDIC lead identification, internal diagram and descriptionIC301: HT16512 (VFD DRIVER)Block diagramPin configuration (Top view)1-6XL-SV205GDPin descriptionSymbol Pin Name Pin No. DescriptionDIN Data input 6 Inputs serial data at the rising edge of the shift clock, starting fr

25、omthe low order bit.DOUT Data output 5 Output serial data at the falling edge of the shift clock, starting fromthe low order bit. This is the N-ch open-drain output pin.STB Strobe 9 Initializes the serial interface at the rising or falling edge of the PD16512.It then waits for reception of a command

26、. Data input after STB has fallen isprocessed as a command. While command data is processed, currentprocessing is stopped, and the serial interface is initialized. While STB ishigh, CLK is ignored.CLK Clock input 8 Reads serial data at the rising edge, and outputs data at the falling edge.OSC Oscill

27、ator pin 44 Connect a resistor to this pin to determine the oscillation frequency to thispin.Seg1/KS1 to High-voltage 15 to 20 Segment output pins (Dual function as key source)Seg6/KS6 outputSeg7 to seg11 High-voltage 21 to 25 Segment output pinsoutput (segments)Grid1 to Grid6 High-voltage 37 to 32

28、Grid output pinsoutput (grid)Seg12/Grid11 to High-voltage 26,28 to 31 These pins are selectable for segment or grid driving.Seg16/Grid7 output(segment/grid)Led to Led Led output 42 to 39 CMOS output. +20 mA max.Key1 to Key4 Key data input 10 to 13 Data input to these pins is latched at the end of th

29、e display cycle.SW1 to SW4 Switch input 1 to 4 These pins constitute a 4-bit general-purpose input port.VDD Logic power 14, 38 5V 10%Vss Logic ground 7, 43 Connect this pin to system GND.VEE Pull-down level 27 VDD-35 V max.IC203: PT2399 (ECHO PROCESSOR)Block diagram1-7XL-SV205GDPin configurationIC20

30、1/IC202,U5/U6: BA4558 (OP-AMP)Pin configurationPin descriptionPin Function1 A Output2 A-Input3 A+Input4 V-5 B+Input6 B-Input7 B Output8 V+Pin descriptionPin No. Pin Name I/O Description1 VCC - Analog supply voltage input2 REF - Analog reference voltage (=1/2Vcc)3 AGND - Analog ground4 DGND - Digital

31、 ground5 CLK_O O System clock output pin6 VCO I Frequency adjustment pin7 CC1 - Current control 18 CC0 - Current control 09 OP1-OUT O OP amplifier 1 outputThis pin can be used as modulated integrator by connecting capacitor.10 OP1-IN I OP amplifier 1 inputThis pin can be used as demodulated integrat

32、or by connecting capacitor.11 OP2-IN I OP amplifier 2 inputThis pin can be used as demodulated integrator by connecting capacitor.12 OP2-OUT O OP amplifier 2 outputThis pin can be used as modulated integrator by connecting capacitor.13 LPF2-IN I Low pass filter 2 input pin14 LPF2-OUT O Low pass filt

33、er 2 output pin15 LPF1-OUT O Low pass filter 1 output16 LPF1-IN I Low pass filter 1 input1-8XL-SV205GDU1: CL680 (MPEG-1 DECODER)Block diagramPin configurationIC101: 7805 (REGULATOR)Block diagram1-9XL-SV205GDPin configurationPin description (Maximum voltage)Signal Input OutputGlobal Interface VDDMAX-

34、INRESET -CLK_SEL(0:2) VDDMAX-INHost InterfaceHCK VDDMAX-IN -HD-IN VDDMAX-IN -HD-OUT VDDMAX-IN1VDDMAX-OUTHRDY - VDDMAX-OUTHSEL VDDMAX-IN -HINT VDDMAX-IN2VDDMAX-OUTCD Interface SignalsCD-BCK VDDMAX-IN -CD-DATA VDDMAX-IN -CD-LRCK VDDMAX-IN -CD-C2PO VDDMAX-IN -CDG-SCK VDDMAX-IN VDDMAX-OUTCDG-SDATA VDDMA

35、X-IN -CDG-VFSY VDDMAX-IN -CDG-SOS1 VDDMAX-IN -DRAM InterfaceMD(15: 0) VDDMAX-IN VDD3MA(10: 0) - VDD3Signal Input OutputRAS(0) - VDD3RAS(1) - VDD3CAS - VDD3MWE - VDD3MCE - VDD3Video InterfacePGIO0 VDDMAX-IN VDD3PGIO1 VDDMAX-IN VDD3PGIO2 VDDMAX-IN VDD3PGIO3 VDDMAX-IN VDD3VCK-IN VDDMAX-IN -VREF Analog

36、-RREF Analog -Y-OUT - AVDDC-OUT - AVDDCOMPOS-OUT - AVDDAudio InterfaceDA-DATA VDDMAX-OUTDA-LRCK VDDMAX-OUTDA-BCK VDDMAX-OUTDA-XCK VDDMAX-IN -DA-EMP - VDDMAX-OUT1-10XL-SV205GDU2: C16256 (4MB DRAM)Block diagramPin configuration Pin descriptionPin No. Pin Name Type Description1619,2226 A0-A8 Input Addr

37、ess input14 RAS Input Row addressstrobe28 CASH Input Column addressstrobe/Upperbyte control29 CASL Input Column addressstrobe/lowerbyte control13 WE Input Write enable27 OE Input Output enable25,610, I/O1 - I/O16 Input/Output Data input/3134,3639 output1,6,20 Vcc Supply Power, 5V21, 35, 40 Vss Ground Ground11,12,15,30 NC - No connect